HOw can I pipe in result of which somecommand to outerCommand so as to replicate result of what I will do in shell as outercommand 'which somecommand'
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Chang Zhao
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Does this answer your question? [Python - How to call bash commands with pipe?](https://stackoverflow.com/questions/7323859/python-how-to-call-bash-commands-with-pipe) – Maurice Meyer Jun 01 '20 at 18:48
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@MauriceMeyer no it doesn't answer my question – Chang Zhao Jun 01 '20 at 18:51
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According to the suggestions of the documentation, I would avoid using the low-level interface Popen, which is tricky to use correctly in the long run, and to mindlessly use shell=True, which might expose you to shell injection attacks.
I would therefore suggest a simpler approach if that's all you need: just capture the output and use it using the new capture_output parameter of the new subprocess.run() API.
This will get what you need:
completed_process = subprocess.run(['outercommand', subprocess.run(['which', 'somecommand'], capture_output=True).stdout], capture_output=True)
completed_process.check_returncode()
print(completed_process.stdout.decode('utf-8'))
Pentracchiano
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